Metallurgical and Materials Transactions B

, Volume 1, Issue 2, pp 395–401 | Cite as

Internal stresses and structures developed during creep

  • L. J. Cuddy
Article
Received:

Abstract

Specimens of 304 stainless steel subjected to different thermomechanical histories develop different internal stresses, σ i , and different substructures. Creep rate is uniquely related not to the applied stress, σ A , but to the effective stress, σ*=(σ A −σ i ). Values of σ* are determined from experimental results and σ i calculated from σ i =(σ A −σ*). Results show σ i increases with the applied stress according to σ i ∝σ A 1.7 . Transmission electron microscopic observations show that the density of dislocations within subgrains, ϱ D , and the subgrain diameter,D, vary with applied stress according to: ϱ D ∝σ A K ,D ∝ σ A −0.8 , whereK=1.4 to 2.0. Subgrain misorientation is independent of creep stress, strain, or temperature. The contributions of these structural variables to the internal stress are discussed.

Keywords

Internal Stress Creep Rate Metallurgical Transaction Volume Kikuchi Line Thermomechanical History 
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Copyright information

© Metallurgical Society of American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc., and American Society for Metals 1970

Authors and Affiliations

  • L. J. Cuddy
    • 1
  1. 1.E. C. Bain Laboratory for Fundamental Research, U. S. Steel CorporationResearch CenterMonroeville

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